-1A+C=22(3) -1B+D=23(4) Question solving process: Add both sides of equation (1) to both sides of equation (3) ,the equations are reduced to: A+B=90(1) C+D=135(2) B+C=112(3) -1B+D=23(4) 交After the exchange of equation (2) and equation (3), the equation system...
C + D = 135 (2) -1 A + C = 22 (3) -1 B + D = 23 (4)解题过程:用第(3) 式两边同时 加上 第 (1) 等式两边,方程组化为: A + B = 90 (1) C + D = 135 (2) B + C = 112 (3) -1 B + D = 23 (4)交换第(2)和第(3)式后,方程组化为: A + B = 90 (1) B...
A+B+C=90(1) 19 50 B-1D+E=0(2) 19 50 A+D=43(3) 0 =0(4) 0 =0(5) Question solving process: Multiply both sides of equation (1) by 19 Divide the two sides of equation (1) by 50, the equation can be obtained: